$(document).ready(function(){
    var song = document.getElementById("songList");
    var bottom = document.getElementById("bottom");
    var m=song.getElementsByTagName("song").length;
   
    if (m>4){
        bottom.innerHTML ="<p>[1][2]</p>"
    }else if (m>16){
        bottom.innerHTML ="<p>[1][2][3]</p>"
    }else if (m>24){
        bottom.innerHTML ="<p>[1][2][3][4]</p>"
    }else if (m>32){
        bottom.innerHTML ="<p>[1][2][3][4][5]</p>"
    }
});